That would be a big negative. I did all my demo with a 250T Grove hydro crane, jack hammers and concrete saws.

We popped all precast off by rigging it with the crane and cutting the clips with a torch. Once we had the beams and columns exposed (structural concrete). We individually rigged each beam and them cut it loose with saw while the crane held it. You can see the the section of building we took down on the left of the bottom picture and the right of the top picture. Its the 6 story black rubber wall you see. There are patients behind that wall!!!

All this demo was on an exisiting, active hospital. The taller building you see in the pictures is it. We're adding on 420,000sf to the existing structure. The biggest column weighed 38,000 pounds. When we cut it loose it only moved 1/4"!!! Now that is a talented crane operator!!!

All that is out of the way, we're building now. 90% of the new sructure is concrete, with a little structural steel where the two buildings connect.